Hyperboloidal worm gear.
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Previously:
https://www.homemadetools.net/forum/...718#post152006
https://www.homemadetools.net/forum/...924#post137518
https://www.homemadetools.net/forum/...1633#post74805
https://www.homemadetools.net/forum/...934#post140623
https://www.homemadetools.net/forum/...8594#post87797